The maestro magnetic low voltage dimmer provides an easy-to-operate tap switch that turns lights on/off to favorite light level. Use the rocker dimmer to adjust lights manually. The delayed fade-to-off feature gives 10 to 60 seconds to leave the room. The 1000VA rating includes the magnetic transformer heat losses and the lamp load. The 800W rating is the maximum lamp wattage based on assumed 20% transformer loss.